If duets pairing double bass and female jazz vocals have become more widely accepted since the days when Sheila Jordan struggled to find work with that lineup, that may be because more people have realized how lovely bass and voice can sound together. Helping the cause is Musica Nuda, whose eponymous 2004 debut album quickly found an audience; since then Petra Magoni (vocals) and Ferrucio Spinetti (bass) have been a steady concert draw. (..)